Spatial and Temporal Changes of Aridity in Argentina and its Relationship with Some Oceanic-Atmospheric Teleconnection Patterns

Author:

Blanco Pedro S.1,Doyle Moira E.1

Affiliation:

1. CONICET ‒ Universidad de Buenos Aires. Centro de Investigaciones del Mar y la Atmósfera (CIMA)

Abstract

Abstract This paper analyzes spatial and temporal changes of aridity in Argentina (1961–2018). The aridity degree, using CRU monthly data, was defined through six climate types classified by De Martonne Aridity Index (DMI). Argentina presents a very arid, arid and semiarid region that extends from Puna to Patagonia, alongside two humid and very humid regions: one located in the Chaco-Pampas Plains and Mesopotamia, and another in the Patagonian Andes. Between these regions, there are subhumid areas with marked aridity variations. These structures persist over time, but in their bordering areas advances or setbacks were observed, with major changes in the Andes (more arid conditions) and Buenos Aires southwest (more humid conditions) during the historical period. The contribution of temperature and precipitation changes to these DMI changes was quantified, indicating that precipitation modulated the DMI spatial changes, while temperature intensified or weakened the magnitudes of these changes. The extension variations of the arid and semiarid regions in Argentina were related to three climate variability modes (El Niño – Southern Oscillation [ENSO], Pacific Decadal Oscillation [PDO] and South Atlantic Ocean Dipole [SAOD]). Significant correlations were found with PDO (r < 0) and SAOD (r > 0), which indicate that an increase in the area occupied by arid and semiarid climates are associated with PDO negative phase or SAOD positive phase. Moreover, when these phases occur simultaneously, the expansion of arid and semiarid regions is larger than under the action of an individual forcing.

Publisher

Research Square Platform LLC

Reference69 articles.

1. Abraham E, Rubio C, Salomón M, Soria D (2014) Desertificación: problema ambiental complejo de las tierras secas. In: En LM, Torres E, Abraham, Pastor G (eds) Ventanas sobre el territorio: Herramientas teóricas para comprender las tierras secas. EDIUNC, Mendoza, Argentina, pp 187–264

2. Documentation of a highly ENSO-related SST region in the equatorial Pacific: Research note;Bamston AG;Atmos Ocean,1997

3. Relationship between temperature and circulation in Southeastern South America and its influence from El Niño and La Niña events;Barros VR;J Meteorological Soc Japan Ser II,2002

4. Precipitation trends in southeastern South America: relationship with ENSO phases and with low-level circulation;Barros V;Theoret Appl Climatol,2008

5. Climate change in Argentina: trends, projections, impacts and adaptation;Barros VR;Wiley Interdisciplinary Reviews: Climate Change,2015

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3